%0 Journal Article %A Ehrenborg, Richard %A Readdy, Margaret %T Coproducts and the cd-index %J Journal of Algebraic Combinatorics %D 1998 %P 273-299 %V 8 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/JAC_1998__8_3_a0/ %G en %F JAC_1998__8_3_a0